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Cool!

I didn't go as far as implementing the CPU, but watching his vids inspired me to write a circuit emulator, also in python:

https://github.com/giannitedesco/primula

I used it to emulate all the various flip flops, but I was thinking of building a computer in it.

That looks really nice, how is the speed? I did the same in C#, and implemented it up to bus and transistor level. I could execute a Fibionacci program in asm but it was horribly slow (less than 1M instructions/sec)

Worth noting that the Apple ][ and C64 had a 1.023MHz clock rate with a minimum of 2 cycles per instruction, so your “horribly slow” system might be about real-time for the era.

(Atari 800 had a 1.77 or 1.79MHz clock, but wasn’t regarded as wildly different.)

Thanks. This looks like an amazing (teaching / exploratory) resource.

Just one question - couldn't immediately see a license file?